In the Biuret test, what color appears if protein is present after adding Biuret reagent?

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Multiple Choice

In the Biuret test, what color appears if protein is present after adding Biuret reagent?

Explanation:
The Biuret test detects peptide bonds in proteins. When peptide bonds are present, copper(II) ions in the alkaline Biuret reagent form a violet complex with those bonds, so the solution changes to a purple, often described as lilac. If no peptide bonds are present (no protein), the reagent remains blue. So with protein present, the color you see is lilac/purple.

The Biuret test detects peptide bonds in proteins. When peptide bonds are present, copper(II) ions in the alkaline Biuret reagent form a violet complex with those bonds, so the solution changes to a purple, often described as lilac. If no peptide bonds are present (no protein), the reagent remains blue. So with protein present, the color you see is lilac/purple.

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